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2012-03-15 Doug Kwan <dougkwan@google.com>

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* arm.cc (Target_arm::got_section): Make .got section read-only
	if -z now is given.
This commit is contained in:
Doug Kwan 2012-03-15 18:24:06 +00:00
parent a4456d242d
commit 7b8957f8c3
2 changed files with 18 additions and 2 deletions
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5
gold/ChangeLog
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@ -1,3 +1,8 @@
2012-03-15 Doug Kwan <dougkwan@google.com>
* arm.cc (Target_arm::got_section): Make .got section read-only
if -z now is given.
2012-03-15 Ian Lance Taylor <iant@google.com>
PR gold/13850

15
gold/arm.cc
View File

@ -4174,11 +4174,22 @@ Target_arm<big_endian>::got_section(Symbol_table* symtab, Layout* layout)
{
gold_assert(symtab != NULL && layout != NULL);
// When using -z now, we can treat .got as a relro section.
// Without -z now, it is modified after program startup by lazy
// PLT relocations.
bool is_got_relro = parameters->options().now();
Output_section_order got_order = (is_got_relro
? ORDER_RELRO_LAST
: ORDER_DATA);
// Unlike some targets (.e.g x86), ARM does not use separate .got and
// .got.plt sections in output. The output .got section contains both
// PLT and non-PLT GOT entries.
this->got_ = new Arm_output_data_got<big_endian>(symtab, layout);
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
(elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
this->got_, ORDER_DATA, false);
this->got_, got_order, is_got_relro);
// The old GNU linker creates a .got.plt section. We just
// create another set of data in the .got section. Note that we
@ -4187,7 +4198,7 @@ Target_arm<big_endian>::got_section(Symbol_table* symtab, Layout* layout)
this->got_plt_ = new Output_data_space(4, "** GOT PLT");
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
(elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
this->got_plt_, ORDER_DATA, false);
this->got_plt_, got_order, is_got_relro);
// The first three entries are reserved.
this->got_plt_->set_current_data_size(3 * 4);